Furnace-top.



Patented July. .1, .1913

FURNAGE TOP'.

APPLICATION FILED JAN. s1, 1913'. l

F. IC. ROBERTS & A. BRODEN.

777257)? #frans/EX FRANK c. ROBERTS, or" WYNNEwoonAND ALBERT BRODEN,onEADING,

PENNSYLVANIA.

rURNAon-Tor.

Be it known that we, FRANK CJROBERTS, a citizen of the United States,residing at l/Vynnewood, county of Montgomery, Vand Stat/e ofPennsylvania, and ALBERT BRoDnN, a citizen of the United States,residing at Reading, State of Pennsylvania, have invented certain -newand useful Improvements in Furnace-Tops', of which the following is aspecilication. The object o! our invention is to provide a furnace` topstructure which will be durable, economical and efficient.

One source of trouble in blastfurnaces has been the wearing away of t-helining of the furnace above the stock line by thestriking of the chargeagainst the furnace lining as it comes from the bell of the hopper. Thefurnace lining above the stock line is open to the effects of the heatand the gases. More or less of the charge entering the furnace, afterleaving the bell, strikes the-lining with enough force tocause-thelining to wear at this point and a result is that the furnacelinino, instead of Wearing uniformly throughout thedieight of the stack,is abraded and destroyed near the top. The present invention obviatesthis defect by discontinuing the masonry lining of the furnace at apoint somewhat below the place where the wear normally comes from theincoming charge striking 'against the lining.

. Above the shortened masonry lining is provided a lining of a moredurable material, preferably iron or steel.. The upper metallic liningis supported independently of the masonry lining and the junctionbetween the twb linings is so' arranged that provision is made forindependent and separate contraction and expansion under varying'conditions of temperature for the two linings. The upper lining may becooled by piercing the outer shell of the furnace and passing a draft ofair about the upper lining or wa- 'or contract with variance oftemperature Specification of Letters Patent. Application meu January a1,1913. i serial No. 745,413.'

hopper.

Patented July 1, i913.

UNiTED STATES PATENT ormoni.. f

without being influenced or restrained by the It will be seen then thatwe have provided i' a furnace having a separate and'independent lmlng atthe upper portion where the mechanical wear comes, which is of durablematerial and which is ca able of bei cooled and preserved and w ich,because'o its separate character, may be renewed orv replaced withoutthe expense or delay incidentto a complete relining of the furnace.

In the accompanyin tion is shown in one orm it may take applied to ablast furnace as used for the re'- duction of iron l or other ores.'

Figure 1 is a transverse, vertical section of the upper art of afurnace; Fig. 2 is a section of a ragment of the metal lining taken atapproximately right angles to. Fig.. 1=. We have shown the furnaceprovided with the usual metallic sheath 1 within which is the masonryIlining 2. It does not extend to the top of the furnace and may beprovided as shown with an irregularly formed top line. Above the masonrywall, in the pres-v ent instance, is an annular bracket 3 riveted orotherwise attached to the furnace sheath on which rests an inwardlyspringing trough 9 which receives the flange ofthe li-p 5 of themetallic lining 4. i The metallic lining 4 drawing the invenis thussupported from the furnace sheath above the upper end of the masonrylining, and out of contact therewith, so that the Amasonry lining inayexpand and contract with variations of temperature in the furnacewithout being impeded by the metallic lining above it, The metalliclining shown 'in the drawing consists of two parts although this is notessential. The lower.'

portion or lip 5 extends downwardly within v an outlet 1:2 to the reliefvalve and about its surface is provided with ribs 13 which in additionto strengthening the structure, form troughs to hold water or othercooling medium. The Water may be let into the troughs through the pipeAlet and overoiv from one trough to another or a series of pipes l5maybe provided which spray the coolingmedium onto the surface of themetallic lining, ,Y Openings 1G may be provided 'in the outer shell ofthe furnace adjacent the metallic lining through which a current of airmay be forced or drawn for cooling the lining. The particular means usedfor cooling the lining is not essential to the present invention and itis obvious that one or more of the specific means described might beomitted. The linin@ is connected at its top with the outer shell1 orsheath by a thin annular plate 17 which forms a vgas seal between thelining and the sliell and which is thin. enough to allow by itsdeformation for independent expansion and contraction of the metalliclining.

Above the metallic lining and independently supported, either from thesheath or from the usual superstructure, is a charging device shownI inthe present instance as a hopper 1S provided with a bell 19.

It will be seen that the charge on entering the furnace will strikeagainst the sides of the metallic lining as it leaves the bell and thatthe wearing due to this impact will be entirely on the metallic lining.The masonry lining ending below this point of impact is protected fromthe wear. The furnace is so constructed that the masonry lining. is freeto contract and expand independently. This construction affords atthe/various points in the furnace the most durable, devices forthevneeds of the furnace at 'each point. It is possible withoutinterfering with the masonry lining to remoye and ref place the metalliclining should it/be destroyed where it receives the greatest wear.

We claim as our invention: i j

1. In a furnace, a sheath, a masonry lining extendingpart way up thesheath, a metal lining supported by the sheath above the masonry andextending therebelow, means for cooling the metal lining, anindependently supported hopper above themetal lining, a junction sealbetween the linings, and a gas seal between the metal lining and thesheath. f

2. In a furnace, a sheath, a masonry 1ining extending part way up thesheath, a metal lining supported by the sheathv above the masonry liningland'not in contact therewith, means for passing a current'of airthrough the chamber between the sheath and metal lining, a Water coolingdevice for the metal lining, a gas seal between the sheath and the metallining, a lip attached to thel metal lining and extending into themasonry 'lining and forming a junction seal therewith, a walter coolingdevice` for the lip, and

independently supported hopper above the metal lining.

3. In a furnace, a masonry lining, a` chargi ing device,- a metal liningbetween the masonry lining and the charging device supportedindependently of them, and means j ing extending part way up the sheath,a

metal lining supported by the sheath above the masonry, means forcooling the metal lining, an independently supported hopper above themetal linin a. junction sealbetween the linings, an a gas seal 'between'the metal lining and the sheatlr..

6. In a furnace, a masonry lining, a charging device, a metall liningbetweenthe masonry lining and the charging device supportedindependently of them, and means for allowing independent expansion landcontraction of the masonry and metal 1inings. 1

7. In a'furnace, a masonry lining, an independently supported metallining thereabove, a junction seal between the linings, and anindependently supported4 charging devi-ce above the metal lining.

Y8. In a furnace, a sheath, a masonry .lin'f ing extending part way `upthe sheath, a metal/'lining supported by the sheath above r.the masonrylining and not in contacttherewith, a water cooling device for the metallining, a gas seal between the sheath and fthe metal lining, a lipattached to the metal lining and extending into the masonry lining andforming a junction seal therewith, `and an independently supportedhopper above the metal lining.

9. In a furnace, a masonry lining, an independcntly supported meta/llining thereabove,

-charging device above the linings.

10. In a furnace, a masonry lining, a:

charging device, and a metal lining between theimasonry lining and thecharging device supported independently of them.

11. In a furnace, a masonry lining, an independently supported metalllining thereabove, an' independently supported charging device above thelinings, gas. seals betweeny the various elements, means for cooling themetal lining, and means for allowing indetpendent expansion ofthelinings..

l 12. In a furnace, a sheath, a masonry lining extending partgwa' up1the slte'ath, a metal lining supported by t e sheath above the masonrylining and not in contact therewith, means for passing a current. of airandY an independently supportedA through the chamber between the sheathand Signed at Philadelphia this 29th day of metal lining, n gas sealbetween the `-sheath January, 1913. i

and the metal lining, a lip attached to the FRANK C, ROBERTS. metallining nml extending into the masonry .A ALBERT BRODEN lining,` 1nd'forming n junction s-el therelVitnesSeS: Witln and anindepenclentlynsupportecl hop- J. DONLDSON BAXTON, per above the metallining. CLARENC S. BUTLER.

